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1.
Someone (usually female) who likes shipping the male characters of the popular manga/anime Axis Powers Hetalia. Hetafags have a tendency to squeal, jump, and/or orgasm when they see their favorite pairing.
Hetafag No. 1: OH MY GOD THE OTHER DAY I REALIZED THAT SPAMANO IS MY FAVE PAIRING!!

Hetafag No. 2: Are you crazy?! It's all about that Germano! At least tell me you still like USxUK!!

Hetafag No. 1: Of course! Nothing could ever stop me from loving Alfred and Arthur's bromance!
by kurosuxeno August 30, 2010
 
2.
someone who is over-obsessed with hetalia, mostly pairings.
especially US X UK and the really stupid ones that don't work together.
Person 1 :Hey, I think Belarus X Italy is the best! Person 2: that's not really possible!

Hetafag Conservation:
Person 1 : OMG US X UK US X UK US X UK! OMG YEAH!
Person 2 : NOOO! US X CA AND UK X HK!!!!
Person 1 : OH YEAAH AND RUSSIA X CHINA!!!
by Canada Takahashi April 04, 2011